Erin Michael O'Toole is a former Canadian politician who served as the member of Parliament (MP) for Durham from 2012 to 2023. A member of the Conservative Party, O'Toole served as the party's leader and the leader of the Official Opposition from 2020 to 2022.

The Conservative Party of Canada, colloquially known as the Tories, is a federal political party in Canada. It was formed in 2003 by the merger of the two main right-leaning parties, the Progressive Conservative Party and the Canadian Alliance, the latter being the successor of the Western Canadian–based Reform Party. The party sits at the centre-right to the right of the Canadian political spectrum, with their federal rival, the Liberal Party of Canada, positioned to their left. The Conservatives are defined as a "big tent" party, practising "brokerage politics" and welcoming a broad variety of members, including "Red Tories" and "Blue Tories".